I'd to modify minimum/maximum brightness for the LED driver (PCA9632 driver). in linux I have the interface for to set brightness level between 0 and 10 using interface `/sys/class/backlight/backlight_keypad/`
I can modify `/sys/class/backlight/backlight_keypad/brightness` but I cannot modify it out of 0-10. I like to have it 0-256 so I can have lower brightness. Based on the driver datasheet and driver source in Individual brightness control mode, each LED output has its own 8-bit resolution (256 steps) so it should be possible to set 0-256. But where should I change it so I would have all 0-256 levels, in the driver source code or linux kernel or somewhere else?